The 123\ALFA 2600 is designed for 6 cylinders Alfa Romeo engines fitted with a Marelli S93A distributor or a Bosch distributor no. 0 231 111 034.

The 123\ALFA-4-R is designed for 4 cylinders Alfa Romeo engines and will fit in an Alfa Giulia, Giulia Nuova, Duetto, Spider and Bertone.